They are expressions.
2. 2 plus 2 equals 4 and 2(2)= 4
In C++ all false relational expressions have a mathematical value of 0.
five plus five equals ten...
If a plus b equals 6 what is the value of 3a plus 3b
These are two expressions, not equations. Expressions do not have solutions, only equations do. NB equations include the equals sign.
2 plus n is the true one, but 1 plus n is not?
You meana += ++a - --a?Well, it can be anything, depending on the compiler's decision. Never ever write expressions like this.
The answer depends on the value of y.